AST to ART
+1hAST
ASTSOURCEART
ARTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and ART on the World Map
The map below highlights the AST (Atlantic Standard Time) and ART (Argentina Time) timezone regions across the globe.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •Puerto Rico uses AST year-round and does not observe DST.
- •AST is 1 hour ahead of EST.
- •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
ART – Argentina Time
UTC-03:00Argentina Time (ART) is the standard time for Argentina, 3 hours behind UTC.
- •Argentina does not observe daylight saving time.
- •Buenos Aires is one of the most visited cities in South America.
- •ART is the same offset as BRT (UTC-03:00).
Comparing Time Zones: AST and ART
AST runs on Atlantic Standard Time (AST) at UTC-04:00. ART runs on Argentina Time (ART) at UTC-03:00. That puts AST 1 hour ahead of ART — a difference of +1h at the current offsets.
In practice, when it is 9:00 AM in AST it is 10:00 AM in ART. Midnight in AST is 1:00 AM in ART. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to ART time conversion table
| AST (AST) | ART (ART) | Day |
|---|---|---|
| 12:00 AM | 1:00 AM | same day |
| 6:00 AM | 7:00 AM | same day |
| 7:00 AM | 8:00 AM | same day |
| 8:00 AM | 9:00 AM | same day |
| 9:00 AM | 10:00 AM | same day |
| 12:00 PM | 1:00 PM | same day |
| 3:00 PM | 4:00 PM | same day |
| 5:00 PM | 6:00 PM | same day |
| 6:00 PM | 7:00 PM | same day |
| 9:00 PM | 10:00 PM | same day |
Why people convert AST to ART time
- Scheduling a call from AST to ART: a 10:00 AM start in AST lands at 11:00 AM in ART, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AST and ART are inside the 9-to-5 working day between 9:00 AM and 4:00 PM AST time (10:00 AM–5:00 PM ART). That is roughly 7 hours of usable overlap.
- Watching a live event or market open: AST viewers need 10:00 AM in ART to catch a 9:00 AM start there, and 11:00 PM if the event is anchored to AST.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +1h gap is not.
- Block 9:00 AM–4:00 PM AST as the recurring meeting window if you work primarily from AST and need ART colleagues present.
About AST (Atlantic Standard Time)
Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.
About ART (Argentina Time)
Argentina Time (ART) is the time zone used throughout Argentina. Argentina does not observe daylight saving time. ART shares the same offset as Brasilia Time (BRT) and Uruguay's UYT.
Best time to call between AST and ART
Both AST and ART sit inside the 9 AM – 5 PM working day between 9:00 AM–4:00 PM AST, which is 10:00 AM–5:00 PM ART. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
AST and ART share 7 hours of working-hours overlap (9:00 AM–4:00 PM AST), so scheduling a live meeting is straightforward.
AST is 1 hour ahead of ART (AST UTC-04:00 → ART UTC-03:00). The shared working window is 9:00 AM–4:00 PM AST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
ART
Does not observe DST
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between AST and ART?
AST (AST, UTC-04:00) is 1 hour ahead of ART (ART, UTC-03:00). The gap is currently +1h.
How do I convert AST time to ART time?
Add +1h to AST local time. For example, 9:00 AM in AST is 10:00 AM in ART.
What time is it in ART right now?
ART uses ART at UTC-03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +1h offset from AST.
What is the best time to call ART from AST?
Call between 9:00 AM and 4:00 PM AST — that maps to 10:00 AM–5:00 PM ART and keeps both parties inside the working day.
Which is ahead, AST or ART?
AST is 1 hour ahead of ART. When it is 12:00 PM in AST it is 1:00 PM in ART.
Does daylight saving time affect the AST–ART difference?
Neither zone observes daylight saving time, so the +1h offset between AST and ART is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and ART?
Not normally. The +1h gap only pushes the date over for late-evening times.
What is the time difference between AST and ART?
ART is +1h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is ART in?
ART operates on its local timezone.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
Which cities are in the ART timezone?
Major cities in the ART timezone include Buenos Aires, Córdoba, Rosario, Mendoza, La Plata, Tucumán.
What is the UTC offset for ART?
Argentina Time (ART) is at UTC-03:00.
What should I know about the ART timezone?
Argentina does not observe daylight saving time. Buenos Aires is one of the most visited cities in South America.
When is it midnight in AST, what time is it in ART?
When it is 12:00 AM (midnight) in AST (AST), it is +1h later in ART (ART).
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See every conversion from AST →·See every conversion from ART →